WordNet (r) 3.0 (2006):

toothbrush tree
    n 1: glabrous or pubescent evergreen shrub or tree of the genus
         Salvadora; twigs are fibrous and in some parts of the world
         are bound together in clusters and used as a toothbrush;
         shoots are used as camel fodder; plant ash provides salt
         [syn: toothbrush tree, mustard tree, Salvadora
         persica]